SQL Factorial Function to Calculate Factorial of an Integer in SQL Server

In SQL Server, developers can use SQL factorial function given in this tutorial to calculate factorial for a given integer value.
For mathematical factorial calculation of an integer input value in SQL Server, sqlFactorial() user-defined function can be used as shown in the SQL tutorial.

If you don't already have a numbers table in your database, you can use following SQL codes to calculate factorial value of an input integer value.